Screw-press.



' G. M. ADAMS.

SCREW PRESS. APPLIOATION FI LEI) JULY 25, 1907.

Patented Aug. 24, 1909.

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INVENTCIFQ. FY55. M Z

5 E s 5 E N H W ATTmRNEm CHARLES H. ADAMS, 0F PROVIDENCE, RHODE ISLAND.

SCREW-PRESS.

Specification of Letters Patent.

Patented Aug. 24., 1909.

Application filed July 25, 1907. Serial No. 385,572.

To all whom 'it may concern:

Be it known that I, CHARLES M. ADAMS, a citizen of the United States,residing at Providence, in the county of Providence and State of RhodeIsland, have invented certain new and useful Improvements inScrew-Presses, of which the following is a specification, referencebeing had therein to the accompanying drawing.

My invention relates to screw presses, more particularly that class ofpresses which is employed to operate upon strips or pieces of metal orjewelry components, and is operated by hand power. The operation of thisclass of presses has heretofore been rendered laborious by the necessityof the operator, who is seated before the press, being obliged to swingthe operating handle before him an excessive distance to produce therequired blow; inaccurate work and loss of power has also resulted bylost motion between the rotary screw spindle and slide; furthermore, therate and distance of travel of the screw shaft was limited. Heretoforeit has been necessary to entirely remove the cross bar from the spindleto adjust the operating handle.

To the end essentially of overcoming the above disadvantages, myinvention consists in providing a novel form of screw shaft andfurnishing novel means for adjusting the cross rod.

Other novel parts and combinations will be hereinafter set forth andclaimed.

In the drawings which form a part of this specification, Figure 1 is afront view of a screw press embodying my invention. Fig. 2, a section ofa portion of the same on line a: a" of Fig. 1, and Fig. 3 a plan view ofthe locking device.

Like reference characters indicate like parts throughout the views.

The framework may be of any form of construction suitable for carryingthe several details of mechanism. In the form thereof herein shown, itconsists essentially of the table, 1, supported by legs, 2, and carryingthe bed, 3, of the head, 4:, whose forward portion forms a bearing, 5.Upon the bed, 3, is attached by clamps 6, the usual holder, 7, of thedie, 8. Mounted in the bearing portion, 5, of the head, which isprovided with threads, 11, is a spindle or screw shaft, 12, providedwith a square right hand thread, 13, engaging the threads, 11. The lowerportion of the shaft, 12, is of reduced diameter, as at 14, and isprovided with square left hand threads, 15, preferably of the same pitchas that of threads, 13. The threads, 15, engage the threads, 16, of anaperture, 17, in a plunger or slide, 18, which moves in vertical guideways, 19, in the head. The slide is provided at its lower end with acavity, 20, to receive the shank, 21, of the tool holder, 22. The shankis engaged by the usual screw, 23. The upward movement of the slide islimited by a shoulder, 25, below the bearing upon the head in the pathof the slide. The downward movement of the slide is limited by the splitcheck nut, 26, mounted upon a reduced portion of the screw shaftimmediately above the threads, 12. The threads, 27, of the reducedportion are preferably fine and left handed, although this direction andpitch are not imperative. The upper extremity of the shaft, 12, iscylindrical and unthreaded and is provided at regular intervals upon itsside with vertically disposed grooves, 29, semicircular in crosssection.

The cross bar, 30, carries upon one end the counterweight, 31, which maybe omitted in light work, and upon its other end the vertical handle,32. The cross bar is provided with an opening, 33, to receive looselythe upper end of the shaft, 12, and has one or more verticalsemi-circular grooves, 34:.

The bar, 30, may be locked in any radial point by turning the same untilthe groove, 34, registers with any,.predetermined groove, 29, therebyproducing a circular orifice into which a cylindrical locking pin, 35,is inserted. Obviously the grooves, 29 and 35, may be of any shape,cross sectionally, provided the locking pin is of corresponding crosssectional contour. By means of this adjustable locking device, therelative position of the handle, 32, is varied as required by theoperator, and without the necessity of removing bar, 30, from the shaft,12.

The press is operated by reciprocating the handle, 32. IVith thisarrangement of threads, the handle when swung to the left causes theslide and tool carrier to descend; when swung toward the right, to rise.In other words, when the portion of the shaft having threads, 13, movesa given distance, the slide, 18, contemporaneously moves practicallydouble the given distance; said total distance being the sum of the leadof threads, 13 and 15. Practically double speed and distance is thusattained, but the most important result is that the handle, 32, need bereciprocated only half the usual distance to produce the required travelof the slide,

18, thereby avoiding torsional strain upon the operators body.

Obviously the direction of the threads, 18 and 15, could be reversed andproduce a press operative by a left handed person; or the screw shaftmight have a uniform diameter a-nd still be operative. It is, however,imperative that the portions of the screw shaft carrying the threads, 13and 15, be in one piece, or in a fixed relative position :to each other.

What I claim is,

1. In a screw press, the combination with the head and a slide, thelatter being provided with a threaded bore, of a rod having threadsengaging said head and provided at its lower end with threads engagingthe bore of said slide, the threads that engage said head and slide,respectively, being right and left handed; said rod being also pro videdwith an additional threaded portion,

and a stop nut mounted on the last mentioned portion of said rod.

2. In a screw press, the combination Wi h the head and a slide, thelatter being provided with a threaded bore, of a rod having threadsengaging said head and provided at its lower end with asecond threadengaging said slide, and a third thread at the upper end, the respectivethreads being of different pitch, a stop n-ut carried by the lastmentioned thread, a cross bar adjustably secured to said rod above saidnut, and a handle depending from the cross bar.

In testimony whereof I have affixed my signature in presence of twowitnesses.

CHARLES M. ADAMS. \Vitnesses Hona'rio E. BELLows, \Vanrnn E. GooDwIN.

